Question

18. The difference of a two-digit number and the number obtained by reversing the digits
is always a multiple of
At
(1) 11
(2) 9
(3) 7
(4) 10​

Answer 1

Answer :-

Let the two digit number = 10x + y

Number obtained by reversing = 10y + x

Difference = 10x + y - 10y - x

= ( 10x - x ) + ( y - 10y )

= 9x - 9y

= 9 ( x - y )

Now, 9 ( x - y ) has one of it factors as 9.

So, The difference of a two-digit number and the number obtained by reversing the digits is always a multiple of 9.

Answer 2

Answer of the question:

If u will take my answer then u will be helpful. .

The answer of this question is 9..

I think you all get my answer and it was helpful for all of u. ...